Electroform replication of smooth mirrors from sapphire masters

Details Electroform replication of smooth mirrors from sapphire masters Electroform replication of smooth mirrors from sapphire masters

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apopt..31.5153a&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 31, no. 25, Sept. 1, 1992, p. 5153, 5154.

Astronomy and Astrophysics

Astronomy

Electroforming, Mirrors, Sapphire, Surface Roughness, Grazing Incidence Telescopes, Mandrels, Optical Properties, Surface Properties, X Ray Astronomy

Scientific paper

A sapphire master was used to produce mirrors that exhibit mid-to-high-frequency roughness as low as 3 A. The fabrication procedure and potential applications in X-ray astronomy are discussed. It is shown that foils replicated from flat smooth mandrels should offer at least equivalent HF roughness and significantly lower mid-frequency ripple than those coated with lacquer. A ceramic-surface mandrel could also be expected to last far longer without the need for repolishing than electroless nickel-coated mandrels.

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